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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae051fa25d1262801af89c6aab03443d025d0bb024fc3c4cea33f92847fadbb5' 
  AND token = 'NUqrQ9gO/hbL4FpgW0DERRG0foqwMPZFOo00Gze8jOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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