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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed2b7d50ef8c85cc61e0d9c6fb4fef56b21ccda40a0ecec68363aab3d29577d2' 
  AND token = 'KTI/kcoPXMa28L4DhA1AVBfilH1xDMmOZxbygFt9f+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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