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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c6f3b23cbc3ad1f6b57847c5e88c3ec82f2b1f82c8934d3e0b3334824cded12' 
  AND token = 's7/vZ2Tbkgjh7I0juKE4Um5yIDuzyq7B4+78H2ovMQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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