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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f14c3b4966be162cde7b2ca55048fe9abe74ddbe6a5a3b8931f2502c582fdaf1' 
  AND token = 'ri02/HJVAvevkBG7a8qHh7xMJvOasBIZ3Pbt4kAha3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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