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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7e6173e9c1e85a5a0751eaf28bc7fb01a1e4a8cc18b3fb4600185fa2ac1e858' 
  AND token = 'zGT/mHgBsv6TAh+rzKa/yX5mmjY3+gHt2gKmvFaT4ME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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