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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3e2e4a0bdd72512ff6ad90ea7c280117b1c2f6b85a4d71fe2ede64a23ffa626' 
  AND token = 'Bghzl0JRR2NVObb1e5nNoM+KBsLS9iSI87aJHhVUD/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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