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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc92a902c6ca19b1445e65490bcccbbd28b89c3d95d8a1095f089811ac0f8490' 
  AND token = '992Rj6SRZnXeePexjhxK+WDPPGzO6UOOrxzSNGRPwSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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