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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89f4d5359eb2de3396bfdc5a8a723170facc8d00361dcc0e102e4a4ac7c1845b' 
  AND token = '03GbVVYK1AszBejtNYjprxbi0OhJqrNP260ZvldZ4t0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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