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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0bc268f25daa4a529a5812cba4f0f3d342c94da5a8714e786f79f43cdae7311' 
  AND token = '32MmiHrQugqk+nnggLx509ogLW9t1Pt4Eow3vagYb2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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