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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c9471ae8d502060bbca5f0cf96e885fab6dcafe9561a41444d438416d53e141' 
  AND token = 'UI1s6+pJr1+9MUcAeY8wMrchWdLMNW0zrnpoCCR0c08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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