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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da033f33d7bc4d29006ba293dff99d885516b8d47b01d81b35742e748ae83b66' 
  AND token = 'g7qlhkVftS42nANk7MRazE9p+ZlLpCK+CxQhp0hTgi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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