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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76d5c5183f2915dee20923d6abf86f0b2f1f55c27bd8c17aedec436318b0f9b4' 
  AND token = 'eB/L7YOxFpz6fIrX3b4/axiAdi+YaGrQU1QJVZF+fpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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