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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1869d8081f22188ced1b3479fa3bec1407a20d3f622f07fda192226313c1301' 
  AND token = 'iA/CU65jaEcOmwTZx1myeNr6nor4j55meshXB6EEr+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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