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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff2c44f150fecf6be40d6107e24a1d5210a61ff8e4bd7a2ee2982f03eff21648' 
  AND token = 'Aal943lwU4t4iFE3uuGilkxCcGdvUPAPHgiMW7HRWxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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