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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d96bb2437dcdbbe866dc58b37238e84e415609d39afd5514c138ae277e124db' 
  AND token = 'qpWKJBh+A/qy91BfBu+EF08WEPI0R3AWJkd89Lp9L80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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