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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '271930d475735f7d66eb947e95f0254a90e3eb4c5f39b59027b87c74b8c4053a' 
  AND token = 'a6CmK5YbTCm/tWvOJOCs5nd9lI60w6vsOIwFOb10wUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00081

JSON explain

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