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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ff1d108eca1530d0f4b8a50b7b60f9d213121bb94c5ddff016d7b9cd90c3259' 
  AND token = 'GPbQ6qtvR+o4Un6kZuAXbqgNJgTzG1uztriIHedK/sM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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