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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f679dbe893948f197d72a32bfc20b9d1114b06715d5eb78ddee7c1857b0431f2' 
  AND token = 'BkBKbp7jpj3m7U5u8qOLSzmfMLep64i2K3Ro5CXxcWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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