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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '775cafe9b8b6d1b5c2a190332e2c334dfe42f5587ebece6795f0911a5233493e' 
  AND token = 'Q9Vg6q6vON8JVlCg06j3mNF4lyn2XEiSrIbeUB5Ix9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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