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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b182b987835b68f2d676238f372896a3d6085551bfc340ee48de72b8057a2eda' 
  AND token = '8dGASeKyTWTGeNZNfCt02edx2BVn5cpo/aTIiH95YWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}