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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0aaad0f6f2707855ac199732c4956d6d6d4753205509795474d874c705581ded' 
  AND token = 'VBBi4jAjzuPJyFRBeo7cv5K9VH+jlt0uH+teYuUSCwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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