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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a92f1f8150ced6f6e4856998cc512414a359fe822266ee2d0bf02daa308cea58' 
  AND token = 'F9mDvB0L3aDMmGOw/1MDqzW0DqAF8Vl0MEgDBGYzkG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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