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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89b9cc61ce2cce48c7567d7253ca04346148b10e9b8e18d36d4d9689ef348182' 
  AND token = 'oYKXikWmiC7m9ef8/DaCyBsarYR69ocyxqsSmSRIaQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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