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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8f52d3b3a036f267be85220781647087ca3aed603b45ce205db3dbfe0ffa83e' 
  AND token = 'ElpZbUwXxTuIvYpAN+fNhUOIy5VyP5oSESv/krI3CPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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