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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb618c3b147fd75e7d5073dfbe59f54549d7dae9de7ab5bce6eb6a183668c2d7' 
  AND token = 'AFAyi8P9a0FpmQqZCqr2rNA60OrGLVie1L+0Gqcf15U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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