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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f505cb32824af7b9f92d3891d13fa290260fa18e85629b9c6486121ca371d5fb' 
  AND token = 'b0SyBmzq5bQtR9k4qRSfLRyiF+HnO9VnW8JkJ9QSC4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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