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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d3f37f4f59a00f0d3441b99c4f7682fd7e79f0335c1cd6d42f02a25ff1c8a78' 
  AND token = 'mBoWKEyqUtyanDpv4FXjhTglwQuDm3xi1Alvu2E6STY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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