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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4f962f12c756ba47c9764de8fb8b3250b70bbfd86ece6db88ce0d5b492d3293' 
  AND token = 'SEqMAMMKbkhdsOeQKZFh5J6bofHZmkuQ6EJk9c+2++A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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