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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e992d6d0e02982b57c5e51b2265451a9c81a3f86533d1ea99966467c0f19fecc' 
  AND token = 'UoXgviMNqZObeo8WHYoETOi6ch7udZmkq07m91kYeyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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