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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a070642b14e8675dba220cc01054b942de85ef2750390a1a066a1bb5a485cc7b' 
  AND token = 'Pg5g0E6sgVZ5AITjcsx+7r48ocMUk89DbQd3KMlVcSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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