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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ea52e95f1fdb1d8a115bab2ab84385a78c1d6ec68d1ccf4f082f7876988d6f3' 
  AND token = 'Xhcr0IQ/bSVcNZj4ZuPS1ad6YXuRtup9FrZRLUDkGBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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