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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b82d82ffb920aa5d2cd69b958aaf5b26dfd96e26d70c31bf9fd14e604c535728' 
  AND token = 'eG2HgJ6g4HGCym0vT/fBnJo2xAg1h1F1J0IGYzv8PxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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