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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '206546356e84a76b054b8c7f1e3a309f61a0f4c30248ad3d2f7e3e79b8df8d84' 
  AND token = 'fU9oFrP+tFn1dRjy7w3FAwyJL0FZErJtLmaKHaHyF+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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