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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '575164a6a4bf27e692db0b55b7f8ee8cb91550ac0e47f2047aebd91b61a3cfc6' 
  AND token = 'bBmkGND9rx24dEKAbmoRe6+ksT4ZNBBsTrPeu8/1Tbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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