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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3450cd93ca757e6a99a125da6287cd0e6eaa773e8b39038cb6439ef2c856e59' 
  AND token = 'E/Awbc14r2i9FTiD29U7+X/e+HjssqkA4OVQ9vL6694=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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