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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '439de4fd9b3d1d9f902feff50d54caecb2edd33843c194b382ec33e91bca2ea9' 
  AND token = 'qYdA3CBFnN7scq5XE/CdCt2OEjNMHpoSoHsKkBE90G0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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