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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '852d36bfd20c3f05c8a7e91cdd0acc7536e6de712fc54053cf0b2552ea91fc5f' 
  AND token = 'NUkjZBJcuSQotdLSQ59Iz98XDThKFeU4k3eHO+ixupQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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