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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6800eaa08300a4fe247c908cee5c2aa2efdaae0c07efd0f09abd1bfc6e1ecb0' 
  AND token = '7vnyydk5mpzrU95SSnDuxczZ1d/BV0ZFkLvDZ6bCmLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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