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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8599c6e4ce5c7ec7bf26ba84a9251730a0f3a4859d80b28b961cf81186cfbec0' 
  AND token = '/lGqmiagMdDCwAyaG1kjBQuR5Vwx1L2ikQvnza8jI7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00099

JSON explain

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