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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e007a6a8af7d1ea6ee23724c3e703088715e0a02505e960bbb79b16e0f4f5d3' 
  AND token = 'ZcfEuWd7hGDnoqXufrL0WyMbhF7/nXkFlaLt8dKdDnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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