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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73987f5654179425ebcb30f53ffb152792978d447c14e7d4c0e2bb5b70d00a72' 
  AND token = 'ucIBLg3kaa8Z5B1purhTYYiwngni/jca/YTzmgda6mk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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