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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12c050573c538eb53e2c2bb0abc5ccf14b3d417db652883d28b50b2c33a28168' 
  AND token = 'ez2lFWiCm4WUa52mwZGvwJ1Cr2JzjRuaGVLwv/R88ps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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