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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac6478c7c6df17c20857b5d533a8957f888e2528306b89485f50c5e9c6cd3f8e' 
  AND token = 'U/RFokqA5BHZk6stZKp174Xa3eW/7IIwvn754Rt/mb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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