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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '991d3186a2ff327f336aa7f2b6d9971af029d9f774fcbbe618b1592a4a0f1da9' 
  AND token = 'HSlwlImwcQyiOnnWHe0yxAowqlMcOIhTE3mUnHg0rWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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