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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14a23e0be263c02b4166cc22e1f3afd0fe5d19fc29ad2ea9b56137b9a1ee5c40' 
  AND token = 'U+MjXPqzQcWand+LQR1uciH2Tml2zwM3lfebpsHyv8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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