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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc97da65ad90155e3551557d20ad0165ba48182de9ad92c56a16f3356fa7124d' 
  AND token = 'zSJlTLQL0R+anfKdRBnuQEydKRc001Sov3ThuFR5/8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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