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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4aeef86e8de9ff3a3e54117055d0d11e2c1f6584e735ca15e64a7f60812cc35' 
  AND token = 'qSzCCbdspt4JwboCNTD1TGrSzPZjgz6r5OPQScO8PWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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