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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3979bd853c1423273950a320ea50e4931400d70556fa50aa472d9d5e4e696fe9' 
  AND token = 'TFS11oM7bYZo3AnryuzaBN78kfVLhoAJ/h+Q2lV3JYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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