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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c2e56b33f1035218b525c68dcbbe2ed3e936ae478fe904e57731e441f370c1f' 
  AND token = 'am5oCxcGaP2JR7CPpyfj9dh8zTKvB0kjavwnjjC1vPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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