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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28f32598fbaa6f26b988a23b2628e81e75a35c663a036cc53e36a1b108c63058' 
  AND token = 'yaK3Mpi5JWYje3r0einycg2km6229n1P7rrt4uaZLsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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