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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '844bb69c94d9a607f2d9a74241ddc5e50fb9e13fea427af5565be8d919eedef3' 
  AND token = '+CI+qLsNrk2dSZ5QWrRW03hhlK18UwXkGgXoGhE37OI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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