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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79d2e32cd3e3242d8804f4e33d3d131593e22bc91722594a9b184da89cee3039' 
  AND token = 's3ApVNutkd8o3F58rnpYrJzCW7xArDmF/Pb4VWuPC5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00174

JSON explain

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