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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fe80986c7bae62e3fa077822355f0c43463bef66a84edf003fc39ec5663c530' 
  AND token = 'k1gdXmfXH5/aPaJXHgTLluc3V5bltYjM86am96fM6D8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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