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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74b4c07e1a27081c72edf9ccc1f52ff88ae7ef083cfb8d89365994484eec9ba3' 
  AND token = 'e7/IhzivH2fm4LrJSxAMhF58c9BhVhPBgAgzKIr/6qk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00104

JSON explain

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