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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90ce46c1bf7afaae8bbc646c10fedb77f4c84aa9666f7412ca8f3043b894d957' 
  AND token = 'C8X2w5fd6IUIXjaKZ0tLQdFSe8KORj5tXZ/dDtGXCRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00097

JSON explain

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