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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa42874ac8927efd32657fcadc64df6ad5cb6794b8bde0f8eb2e03990f1813cc' 
  AND token = 'aOwTBm5LfxF6pwm1g7dYPopF8wgYd3b4P1nlbmmMRlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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